Buddypress pages redirect to homepage

hi,
i installed Buddypress onto my existing site yesterday and it was working fine. i started to modify the theme and managed to get everything working ok.

I trialled about 3 different facebook connect plugins to see which worked the best (individually) but after that i noticed that if i, say, tried to mention a user or edit my profile the site would just redirect to the homepage.

Is this something anyone has come across before.. i cant work out which was the offending plugin or what to do to fix it. my site is http://donnasdream.co.uk .. ive reverted back to the original theme but i will turn the buddypress plugin back on for people to have a look (please note, the theme its currently on isnt formatted properly but it should work)